<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    123
</body>
</html>
<script>
    var a=5;
    var b;
    var as;
    var c="123";
    console.log(Number(c))
    console.log(parseInt(c))
    console.log(parseFloat(c))
    console.log(String(a));
    console.log(a.toString());
    console.log(a);
    console.log(Boolean(a));
    console.log(Boolean(b));
    console.log(9%17);
    console.log(a<c&&as===b);
    
    
</script>